90/2.5L/m/t
yes, some jeeps run a fixed orifice. (the i6 allows that) some use a check valve. so if 4cylinder that is very different engine PCV .
my first ever, jeep 88 4.0L had an orifice only PVC, (CCV)
keep in mind is it is A loop. one side is clean fresh air (from air cleaner stolen from)
and the other end is PCV (check valve or and orifice) that sucks out the crankcase fumes.
mixing up engine parts can be hard.
93 over 90 engine, mix. i4 only
lets see what the OEM FSM says about both engines.
free to read in the sticky.
the hard part of cars, is the books do not go into the design of the engine nor PVC, details very well.
the best way is just do your own examinations of each stock part and learn what is really there, even buy new part for it, so wrong parts there now are removed first. (many jeeps are hacked up with wrong parts or worse clone junk from 12k miles away.
the FSM covers 3 engines so 2.5L is it.
chapter (0) zero PVC
page 18 here it is 90
as you see the fresh air hose is bottom right.
the PCV (real a check valve works best) but the orifice kind love to fail. (not just clogged even prefect it fails)
why well the loop can reverse, with bad rings (piston) and over whelm the silly Orifice.
and then blasts. oil fumes to the was clean air filter.
now that you know that, what works best for you? is based on blow-by gas rates on very old engines.
next the 93 same PCV loop details, from the real OEM FSM manual. free.
the fitting top left is an orifice too. (fitting)
0-20 ch0,page 20
if bypass gasses are too much, ream out the orifice. (do not allow crankcase pressure go too high or seals leak or fail.)<<< old old engine answers.
if engine is very good the 2.2mm is spec, run that. I will now measure mine, 95. and post. next.(soon)